science & tech MCQ section 6 MCQ Questions & Answers Detailed Explanation

Answer: (d)

A small telescope of NASA in Jan. 2103 has captured surprising images of “magnetic braids” in the outer atmosphere, or corona, of the sun.

Answer: (a)

Kalpana Chawla was the first Indian American astronaut to go into space in November 1997 as part of the six-astronaut crew that flew the Space Shuttle Columbia flight STS-87.

Chawla was the first Indian-born woman and the second Indian person to fly in space, following cosmonaut Rakesh Sharma who flew in 1984 on the Soyuz T-11. She died during her second space mission aboard Space Shuttle Columbia in 2003.

Answer: (a)

According to the Indian government, 27 Indian satellites are currently operational. Out of these, 11 are communication satellites, 12 are earth observation satellites, 3 are navigational satellites and 1 is MOM.

Answer: (b)

Heavy water, formally called deuterium oxide (D2O), is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium, (also known as heavy hydrogen). In nuclear reactors, heavy water acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238.

Answer: (d)

Compounds including Carbon dioxide, Nitrous oxide, Black carbon, Methane, Sulphur dioxide and CFCs are major contributors to global warming.

Answer: (a)

A geosynchronous satellite is a satellite in geosynchronous orbit, with an orbital period the same as the Earth’s rotation period. Such a satellite returns to the same position in the sky after each sidereal day, and over the course of a day traces out a path in the sky that is typically some form of the analemma.

Geosynchronous satellites have the advantage of remaining permanently in the same area of the sky, as viewed from a particular location on Earth, and so permanently within view of a given ground station.

Geostationary satellites have the special property of remaining permanently fixed in exactly the same position in the sky, meaning that ground-based antennas do not need to track them but can remain fixed in one direction.